/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.ib.mtalk.util;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorMatrix;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;



public  class ColorSelector extends View {
	
	public static final int CENTER_X	= 100;
	public static final int CENTER_Y	= 100;
	public static final int CENTER_RADIUS	= 32;
	public static final int STROKE_WIDTH	= 32;
	public static final int CENTER_STROKE_WIDTH	= 5;
	
	private Paint mPaint;
    private Paint mCenterPaint;
    private  int[] mColors;
    private OnColorChangedListener mColorChangedListener;
    private OnColorSelectedListener mColorSelectdListener;
    
    private int center_x;
    private int center_y;
    private int center_radius;
    
    private int mInitialColor;
     
    public interface OnColorChangedListener {
        void colorChanged(int color);
    }

                   
    public interface OnColorSelectedListener {
        void colorSelected(int color);
    }
	
    public ColorSelector(Context context, AttributeSet attrs, int defStyle) 
	{
		super(context, attrs, defStyle);
		init();
	}
	public ColorSelector(Context context, AttributeSet attrs) 
	{
		super(context, attrs);
		init();
	}
	public ColorSelector(Context context) 
	{
		super(context);
		init();
	}
	

	
	void init() 
    {

        mColors = new int[] {
            0xFFFF0000, 0xFFFF00FF, 0xFF0000FF, 0xFF00FFFF, 0xFF00FF00,
            0xFFFFFF00, 0xFFFF0000
        };
        Shader s = new SweepGradient(0, 0, mColors, null);
        
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaint.setShader(s);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeWidth(GraphicUtil.DipToPixel(ColorPickerDialog.parent_activity,STROKE_WIDTH ));
        
        mCenterPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mCenterPaint.setStrokeWidth(GraphicUtil.DipToPixel(ColorPickerDialog.parent_activity,CENTER_STROKE_WIDTH));
        
        center_x = GraphicUtil.DipToPixel(ColorPickerDialog.parent_activity, CENTER_X );
        center_y = GraphicUtil.DipToPixel(ColorPickerDialog.parent_activity, CENTER_Y);
        center_radius = GraphicUtil.DipToPixel(ColorPickerDialog.parent_activity,CENTER_RADIUS );
		
    }
    private boolean mTrackingCenter;
    private boolean mHighlightCenter;

    public void  setInitialColor( int init_color) {
    	mInitialColor = init_color;
    	mCenterPaint.setColor(mInitialColor);
    }
    
    public void setColorPickerChangedListener( OnColorChangedListener listener ) 
    {
    	mColorChangedListener = listener;
    }
    public void setColorPickerSelectedListener( OnColorSelectedListener listener ) 
    {
    	mColorSelectdListener = listener;
    }
    
    @Override 
    protected void onDraw(Canvas canvas) {
       float r = center_x - mPaint.getStrokeWidth()*0.5f;
        
        canvas.translate(center_x, center_x);
        
        canvas.drawOval(new RectF(-r, -r, r, r), mPaint);            
        canvas.drawCircle(0, 0, center_radius, mCenterPaint);
        
        if (mTrackingCenter) {
            int c = mCenterPaint.getColor();
            mCenterPaint.setStyle(Paint.Style.STROKE);
            
            if (mHighlightCenter) {
                mCenterPaint.setAlpha(0xFF);
            } else {
                mCenterPaint.setAlpha(0x80);
            }
            canvas.drawCircle(0, 0,
            		center_radius + mCenterPaint.getStrokeWidth(),
                              mCenterPaint);
            
            mCenterPaint.setStyle(Paint.Style.FILL);
            mCenterPaint.setColor(c);
        }
    }
   
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        setMeasuredDimension(center_x*2, center_y*2);
    }
  

    private int floatToByte(float x) {
        int n = java.lang.Math.round(x);
        return n;
    }
    private int pinToByte(int n) {
        if (n < 0) {
            n = 0;
        } else if (n > 255) {
            n = 255;
        }
        return n;
    }
    
    private int ave(int s, int d, float p) {
        return s + java.lang.Math.round(p * (d - s));
    }
    
    private int interpColor(int colors[], float unit) {
        if (unit <= 0) {
            return colors[0];
        }
        if (unit >= 1) {
            return colors[colors.length - 1];
        }
        
        float p = unit * (colors.length - 1);
        int i = (int)p;
        p -= i;

        // now p is just the fractional part [0...1) and i is the index
        int c0 = colors[i];
        int c1 = colors[i+1];
        int a = ave(Color.alpha(c0), Color.alpha(c1), p);
        int r = ave(Color.red(c0), Color.red(c1), p);
        int g = ave(Color.green(c0), Color.green(c1), p);
        int b = ave(Color.blue(c0), Color.blue(c1), p);
        
        return Color.argb(a, r, g, b);
    }
    
    @SuppressWarnings("unused")
	private int rotateColor(int color, float rad) {
        float deg = rad * 180 / 3.1415927f;
        int r = Color.red(color);
        int g = Color.green(color);
        int b = Color.blue(color);
        
        ColorMatrix cm = new ColorMatrix();
        ColorMatrix tmp = new ColorMatrix();

        cm.setRGB2YUV();
        tmp.setRotate(0, deg);
        cm.postConcat(tmp);
        tmp.setYUV2RGB();
        cm.postConcat(tmp);
        
        final float[] a = cm.getArray();

        int ir = floatToByte(a[0] * r +  a[1] * g +  a[2] * b);
        int ig = floatToByte(a[5] * r +  a[6] * g +  a[7] * b);
        int ib = floatToByte(a[10] * r + a[11] * g + a[12] * b);
        
        return Color.argb(Color.alpha(color), pinToByte(ir), pinToByte(ig), pinToByte(ib));
    }
    
    private static final float PI = 3.1415926f;

    public void setColor(int color) 
    {
    	mTrackingCenter = true;
    	mCenterPaint.setColor(color);
        invalidate();
        mTrackingCenter = false;
    }
    
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        float x = event.getX() - center_x;
        float y = event.getY() - center_y;
        boolean inCenter = java.lang.Math.sqrt(x*x + y*y) <= center_radius;
        
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                mTrackingCenter = inCenter;
                if (inCenter) {
                    mHighlightCenter = true;
                    invalidate();
                    break;
                }
            case MotionEvent.ACTION_MOVE:
                if (mTrackingCenter) {
                    if (mHighlightCenter != inCenter) {
                        mHighlightCenter = inCenter;
                        invalidate();
                    }
                } else {
                    float angle = (float)java.lang.Math.atan2(y, x);
                    // need to turn angle [-PI ... PI] into unit [0....1]
                    float unit = angle/(2*PI);
                    if (unit < 0) {
                        unit += 1;
                    }
                    mCenterPaint.setColor(interpColor(mColors, unit));
                    mColorChangedListener.colorChanged(mCenterPaint.getColor());
                    invalidate();
                }
                break;
            case MotionEvent.ACTION_UP:
            //    if (mTrackingCenter) {
                    if (inCenter) {
                    	//mColorChangedListener.colorChanged(mCenterPaint.getColor());
                    	mColorSelectdListener.colorSelected(mCenterPaint.getColor());
                    }
                    mColorChangedListener.colorChanged(mCenterPaint.getColor());
                    mTrackingCenter = false;    // so we draw w/o halo
                    invalidate();
              //  }
                break;
        }
        return true;
    }
}

 
